[Coco] CoCo 2 Factory Composite Video RE'd

[Zippster]

Let me clean it up a bit and I’ll get it posted.

- Ed


> On Dec 14, 2014, at 7:16 AM, lciotti1 <lciotti1 at gmail.com> wrote:
> 
> Cough...cough... schematic please!
> 
>> Zippster <mailto:zippster278 at gmail.com>
>> December 14, 2014 at 12:27 AM
>> Hi Everybody,
>> 
>> I’ve successfully reverse-engineered the factory composite board found in
>> a CoCo 2 I purchased on ebay. This board is a direct replacement for the RF modulator.
>> It requires no modifications to the case, and uses the channel switch to select B&W or COLOR.
>> 
>> It seems to have very good output - I’d say better than the reference circuit from the 6847 data sheet.
>> It’s a more involved circuit with voltage regulators on-board and is AC coupled.
>> 
>> Pics of the factory and re’d prototype can be seen here for those who are interested.
>> 
>> <https://sites.google.com/site/thezippsterzone/coco2-composite-board-2 <https://sites.google.com/site/thezippsterzone/coco2-composite-board-2>>
>> 
>> 
>> - Ed
>> 
>> Allen Huffman <mailto:alsplace at pobox.com>
>> December 13, 2014 at 11:54 PM
>> 
>> 
>> Here is a placeholder page for this “contest”:
>> 
>> http://www.cocopedia.com/wiki/index.php/CoCoCoding_1980_Contest <http://www.cocopedia.com/wiki/index.php/CoCoCoding_1980_Contest>
>> 
>> We can come up with ideas and suggestions. I just haven’t had time to think about it much.
>> 
>> Xroar can run Color BASIC 1.0 (bas10.rom is what you want) so that would be a very easy one to get going to play with this if you don’t have an actual 4K CoCo around ;-)
>> 
>> I will have to add a section about using Xroar and setting up a cassette image and stuff.
>> 
>> — Allen
>> 
>> 
>> Allen Huffman <mailto:alsplace at pobox.com>
>> December 9, 2014 at 2:56 PM
>> Would anyone be interested in having some silly fun, and writing programs for the original 1980 4K CoCo with COLOR BASIC 1.0?
>> 
> 
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